linux-kernel - Re: [PATCH v4 1/3] iio: Add modifier for white light

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Date:   Fri, 3 Aug 2018 12:44:44 +0200
From:   Parthiban Nallathambi <pn@...x.de>
To:     Peter Meerwald-Stadler <pmeerw@...erw.net>
Cc:     pn@...x.de, jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
        robh+dt@...nel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, mark.rutland@....com,
        devicetree@...r.kernel.org, matthias.bgg@...il.com, wd@...x.de,
        sbabic@...x.de, hs@...x.de
Subject: Re: [PATCH v4 1/3] iio: Add modifier for white light

Hello Peter,

On 08/02/2018 09:30 PM, Peter Meerwald-Stadler wrote:
> Hello,
> 
> it is not clear to me why 'white' is needed;
> isn't that the default, i.e. unfiltered light?

Yes, it is. But devices like vcnl4035 veml7700, White LED data one
register and all other sources of light (like fluorescent,
incandescent ,sunlight) in separate register.

So in such cases this WHITE modifier is needed. Should it needs to
come under IIO_MOD_LIGHT_CLEAR?

> 
> thanks, regards, p.
> 
>> Signed-off-by: Parthiban Nallathambi <pn@...x.de>
>> ---
>>   Documentation/ABI/testing/sysfs-bus-iio | 7 +++++++
>>   drivers/iio/industrialio-core.c         | 1 +
>>   include/uapi/linux/iio/types.h          | 1 +
>>   tools/iio/iio_event_monitor.c           | 2 ++
>>   4 files changed, 11 insertions(+)
>>
>> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
>> index 731146c3b138..43e481aed5b2 100644
>> --- a/Documentation/ABI/testing/sysfs-bus-iio
>> +++ b/Documentation/ABI/testing/sysfs-bus-iio
>> @@ -1312,6 +1312,13 @@ Description:
>>   		standardised CIE Erythemal Action Spectrum. UV index values range
>>   		from 0 (low) to >=11 (extreme).
>>   
>> +What:		/sys/.../iio:deviceX/in_intensityY_white_raw
>> +KernelVersion:	4.18
>> +Contact:	linux-iio@...r.kernel.org
>> +Description:
>> +		Modifier white indicates that measurements contain white LED
>> +		component.
>> +
>>   What:		/sys/.../iio:deviceX/in_intensity_red_integration_time
>>   What:		/sys/.../iio:deviceX/in_intensity_green_integration_time
>>   What:		/sys/.../iio:deviceX/in_intensity_blue_integration_time
>> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
>> index 19bdf3d2962a..cb939b9fad16 100644
>> --- a/drivers/iio/industrialio-core.c
>> +++ b/drivers/iio/industrialio-core.c
>> @@ -108,6 +108,7 @@ static const char * const iio_modifier_names[] = {
>>   	[IIO_MOD_LIGHT_GREEN] = "green",
>>   	[IIO_MOD_LIGHT_BLUE] = "blue",
>>   	[IIO_MOD_LIGHT_UV] = "uv",
>> +	[IIO_MOD_LIGHT_WHITE] = "white",
>>   	[IIO_MOD_QUATERNION] = "quaternion",
>>   	[IIO_MOD_TEMP_AMBIENT] = "ambient",
>>   	[IIO_MOD_TEMP_OBJECT] = "object",
>> diff --git a/include/uapi/linux/iio/types.h b/include/uapi/linux/iio/types.h
>> index 4213cdf88e3c..de87a6c7e6de 100644
>> --- a/include/uapi/linux/iio/types.h
>> +++ b/include/uapi/linux/iio/types.h
>> @@ -84,6 +84,7 @@ enum iio_modifier {
>>   	IIO_MOD_CO2,
>>   	IIO_MOD_VOC,
>>   	IIO_MOD_LIGHT_UV,
>> +	IIO_MOD_LIGHT_WHITE,
>>   };
>>   
>>   enum iio_event_type {
>> diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c
>> index b61245e1181d..a2f9c62a79dd 100644
>> --- a/tools/iio/iio_event_monitor.c
>> +++ b/tools/iio/iio_event_monitor.c
>> @@ -96,6 +96,7 @@ static const char * const iio_modifier_names[] = {
>>   	[IIO_MOD_LIGHT_GREEN] = "green",
>>   	[IIO_MOD_LIGHT_BLUE] = "blue",
>>   	[IIO_MOD_LIGHT_UV] = "uv",
>> +	[IIO_MOD_LIGHT_WHITE] = "white",
>>   	[IIO_MOD_QUATERNION] = "quaternion",
>>   	[IIO_MOD_TEMP_AMBIENT] = "ambient",
>>   	[IIO_MOD_TEMP_OBJECT] = "object",
>> @@ -178,6 +179,7 @@ static bool event_is_known(struct iio_event_data *event)
>>   	case IIO_MOD_LIGHT_GREEN:
>>   	case IIO_MOD_LIGHT_BLUE:
>>   	case IIO_MOD_LIGHT_UV:
>> +	case IIO_MOD_LIGHT_WHITE:
>>   	case IIO_MOD_QUATERNION:
>>   	case IIO_MOD_TEMP_AMBIENT:
>>   	case IIO_MOD_TEMP_OBJECT:
>>
> 

-- 
Thanks,
Parthiban Nallathambi

DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@...x.de